John Thomas O'Neil was an Irish Anglican priest."The book of dignities", Ockerley, H: London, W.H. Allen and Co., 1890
Educated at Trinity College, Dublin, he was the Chancellor of Killaloe Cathedral before his appointment as Dean of Kilmacduagh in 1837."Fasti ecclesiae Hibernicae: the succession of the prelates and members of the Cathedral bodies of Ireland", Cotton, H: Dublin: James Charles & Son, 1878 He resigned the following year.
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